Hollow grate and feed-water heater



No Model.) 2 Sheets-Sheet 1. D. JONES.

HOLLOW GRATB AND FEED WATER HEATER.

No. 340,916. Patented Apr. 27, 1886.

(No Model.) 2' Sheets-Sheet 2.

D. J ON'BS.

HOLLOW GRATE AND FEED WATER HEATER.

No. 340,916. Patented Apr; 27, 1886';

in the furnace.

UNITED STATES PATENT OFFICE.

DAVID JONES, OF PARIS, ASSIGNOR OF ONE-HALF TO S. COOLEY, OF

' HENRY COUNTY, TENNESSEE.

HOLLOW GRATE AND FEED-WATER HEATER.

SPECIFICATION forming part of Letters Patent No. 340,916, dated April 27, 1886.

- Application filed February 24, 1880. Serial No. 192,990. (No model.)

.TO aZZ whom it may concern.-

Be it known that 1, DAVID J ONES, of Paris, in the county of Henry and State of Tennessee, have invented certain new and useful Improvemen ts in Hollow Grates and Feedater Heaters; and I do hereby declare that the following is a full, clear, and exact description of the invention, which will enable others skilledin the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which form part of this speciiication.

My invention relates to heating feed-water for steam-boilers and to that class in which the water is heated by passing through hollow grate-bars.

It has been the practice to make the ordinary grate-bar hollow, and it being of castiron necessarily the bars were made wide, which reduced the number of spaces between the bars for the admission of the proper proportion of air for the complete combustion of the coal. In other instances, where the bars were made of tubes or pipes to get the proper spaces for the air, which must be of uniform width in all furnaces, as the coal would drop through before being burned, the tubes or bars used were smaller in diameter. This reduction of the diameter of the tubes necessitated the shortening of their length, as along tube with the weight of the coal and the action of the fire-tools in working the fire caused the tubes to sag or bend and probably leak attheir joints.

To obviate the difficulties above mentioned I have devised a grate or feed-water heater that consists of the tubular grate with one of its outer tubes resting on the wall of the furnace, and bent or turned about midway of its length, and forming a support for the remaining tubes bypassing under them and resting upon the opposite wall.

Referring to the drawings, Figure 1 is a perspective view showing the heater in place Fig. 2 is a longitudinal view of the furnace, Fig. 3 is an end view with the front wall removed, and Fig. 4 is an enlarged view of the heater or grate.

Referring to the drawings by letter, A is an ordinary return-flue boiler; B, the furnace; G, the heater or water-grate, which consists of the tubes 0, connected to headers dat the front and back of the furnace. To one end of the heater, at the back of the furnace, is attached the pipe 6, through which the feedwater is forced. At the other end is attached a valved pipe, f, for blowing off sediment.

The heater may consist of a continuous coil of pipe from one side of the furnace to the other. The last tube grests upon the furnacewall for about half its length,where it changes its course across the furnace,where it rests on the other wall and supports the tubes 0. The

tube 9 from its last resting-place leads to the front of the furnace and thence to the boiler, where the water enters in a highly heated condition. I have shown the pipes 9 leading into the forward smoke-box.

It will be seen from the foregoing that a very efficient feed-water heater and grate of large area can be produced at avcry small expense.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, 18-

1. A feed-water heater consisting of a series of tubes forming the grate-bars of the furnace, the outer tubes resting on the walls ofthe said furnace for about half its length, and passing under to the other wall and supporting the other tubes, as set forth.

2. A feed water heater consisting of tubes forming the grate-bars of the furnace and sup ported about its center by the outer tube, that rests upon the walls of thefurnace, which passes from one side of the furnace to other, and.is provided with an inlet, outlet, and blow-off pipes, as set forth.

In testimony that I claim the foregoing as 0 my own I affix my signature in presence of two witnesses.

DAVID JONES.

\Vitnesses: WM. Roenns, W. F. HAnRIs. 

